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slightly distorted, then don t bother with resizing This has the advantage of avoiding artifacts caused by downscaling If you need to match graphics to video, such as for menu transitions or motion menu subpicture overlays, then you will usually need to slightly alter the scaling process above for 525-line (NTSC) video The exact details depend on your video source and your MPEG-2 video encoder Video from D1 tape has pixel dimensions of 720 486 To conform to MPEG-2 dimensions of 720 480, some encoders scale and some encoders crop the extra six lines; however, no consistent approach exists Some crop 3 from the top and 3 from the bottom, others crop 6 from the bottom, some crop 2 and 4, and so on6 You will need to do some research or testing of your encoder to find out what it does Then, instead of scaling to 720 480, scale to 720 486 and then crop the picture the same way your video encoder does This will ensure that everything lines up properly when transitioning from graphics to video or vice versa Another approach is to render graphics as one-second stills at the end of the motion video After encoding, you can extract the first I-frame of the still sequence and use it for the menu graphic Since it was encoded along with the video, it will match perfectly Safe Areas Most televisions employ overscan, which covers the edges of the picture Overscan can hide as much as 10 percent of the picture Two common safe areas are used to account for this The action-safe area defines a 5 percent boundary as a guideline for the area where action or important video content should be kept The title-safe area defines a 10 percent boundary as a guideline for the area in which text and other vital information should be kept (see Figure 126) The DVD Demystified sample disc includes safe area templates Some programs have built in video safe templates In After Effects, for example, press the apostrophe key to turn them on and off Most modern TVs don t have more than 5 percent overscan, but older or cheaper models may approach 10 percent Computers, LCD or plasma screens, and many video projectors have little or no overscan Video Artifacts Because there are one billion interlaced televisions in the world that your DVD video might be displayed on, you must consider interlace artifacts The fundamental problem is that since only every other horizontal scan line is displayed at a time, thin horizontal lines disappear
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Cropping an odd number of lines (1, 3, or 5) is a bad thing for video, since it changes field dominance and can cause interlacing artifacts For stills, field dominance is irrelevant
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Figure 126 Video safe areas
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and reappear 60 times a second This interlaced twitter effect (also called flicker) can be especially bad with computer-generated graphics In addition to interlace artifacts, chroma crawl and color crosstalk from composite video signals make thin lines or sharp color transitions problematic, despite their orientation To reduce these effects, use the antialiasing and feathering features of your graphics software whenever possible Make sure that all horizontal lines are at least two pixels thick To be even more careful, keep the thickness of horizontal lines at multiples of two pixels7 Use gradual color transitions instead of sharp contrasts between dark and light colors To adapt existing graphics, or as a final pass before encoding, apply a blur filter to the entire image or to offending areas For example, a Gaussian blur of 05 to 1 has little visual effect but helps to reduce video artifacts Also, because blurring reduces high-frequency detail, the MPEG compression will be more efficient, possibly resulting in higher quality
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7 This advice only applies when you are working at native NTSC video resolution of 480 lines If you create graphics at higher resolutions, the number of pixels will change when the graphic is scaled down This doesn t apply to 625-line (PAL) video, since it s generally scaled horizontally, not vertically
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